DIAPHRAGM VALVES

DIAPHRAGM VALVES
TECNIK
Diaphragm Valve is typically one of the most economical valve
solutions in chemical applications due to the wide choice of wetted
materials.
Available a manual (handwheel operated) & Actuated
version (on-off / control)
Broad Material Availability:
Given the various body and diaphragm materials, Diaphragm Valve
often provides the most economical solution for your process system,
within the valve's design parameters.
Slurry Applications:
Due to the streamlined flow path and virtual absence of cavities, the
diaphragm valve is ideal for slurry applications. Cavities within valves
tend to entrap solids, either increasing the valve's operational torque
or inhibiting operation. Weir TYPE Diaphragm Valve is recommended
for slurries containing 15% or less solids. For slurries exceeding 15%
solids, the Straightway Diaphragm Valve is recommended.
High Purity Applications:
Unlined – Stainless Steel body Diaphragm Valve is the proven
selection to minimize particle generation and product entrapment
inherent to other valve types.
Corrosive Applications:
A broad selection of plastic linings and PTFE diaphragms, coupled
with our corrosion resistant coatings, provide an excellent barrier to
chemical attack and corrosion.
Bubble Tight Shut-off:
Weir type Diaphragm Valves provide bubble tight shut-off from very
low ( 1” of Hg ) to 200psig
Bonnet Isolation:
Working parts are isolated from the process fluid.
Vacuum Applications:
The diaphragm valve is capable of bubbletight shut-off down to 0.1
micron. Elastomer or Teflon® PTFE diaphragms may be used. The inleakage rate is less than 1 x 10-6 cc-atm/sec for elastomer
diaphragmst.
Feature
UNLINED
RUBBER-LINED
GLASS LINED
PLASTIC
Fluropolymer lined
Sizes
1/2" - 12"
1/2" - 12"
1/2" - 3"
1/4" - 6"
1/2" - 6"
End Connections
Flanged,
Screwed, Socket
weld
Flanged
Flanged
Socket Weld,
Flanged, Spigot
Flanged
Body Material
CI / CS / SS
CI / CS / SS
CI
PP, ISO PP, PVDF
CS / SS
Lining Options
N.A.
Neoprene, EPDM,
Ebonide, Hypalon,
Butyl, others
Glass
N.A.
PVDF, PFA, FEP,
ETFE, HYLAR,
others
TECNIK
ADVANTAGES OF DIAPHRAGM VALVES
Corrosion
The various combinations of valve body linings and diaphragms offer
a practical solution to almost any corrosive fluid. In addition, any
combination will provide the basic design features of in-line
maintenance, bonnet isolation and positive, bubble tight closure.
Abrasion
Multiple combinations of abrasion resistant diaphragms and body
linings are available to solve abrasive problems. Because the
diaphragm isolates the working parts from the process fluids, the fluid
contacts only the abrasion resistant diaphragm and body or lining.
Clogging
Ideally suited for Viscous fluids, fibrous slurries and other materials.
As the diaphragm lifts high into the bonnet offering negligible
resistance to flow in either direction, thus eliminating any possibility of
clogging. Conversely, positive closure is assured by the large area of
contact between the resilient diaphragm and the body. Diaphragm
valves are self-draining and self-cleaning.
Contamination
Pharmaceutical and biotechnology sanitary service requirements are
ideally handled by unlined stainless steel body diaphragm valve.
Valves are cavity free and can be CIP and SIP. These valves are
available in a variety of sanitary end connections, diaphragms, bodies
and bonnet assemblies.
Vacuum and Gas Handling
Stem leakage is improbable because the diaphragm completely seals
the bonnet from the gas traveling through the valve body.
Furthermore, absolute closure of the valve greatly reduces the
possibility of gas leakage when in the closed position. These
features, combined with low gas permeability, make the diaphragm
valve especially suitable for gas and/or vacuum services.
Control
Throttling of highly corrosive or abrasive media can be economically
managed diaphragm valve, where accuracy in control is not of
paramount importance.
TYPICAL APPLICATIONS / SERVICE
Acids
Demineralizer systems
Mist eliminator
Caustics
Plastics manufacturing
Recycled water
High purity chemicals
Flue Gas Desulfurization
Rubber manufacturing
Agricultural chemicals
(FGD)
Chlorine manufacturing
TECNIK
DIAPHRAGM VALVE LINING / MATERIAL OPTIONS
Unlined Metal
Machine Contoured Weir for Improved Shut-off
Excellent Cv's
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Complete Selection of End Connections
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Materials Include :
• Cast Iron
• Cast Steel ASTM A-216 Grade WCB
• 316 Stainless Steel ASTM A-351 Grade CF8M
• 316L Stainless Steel ASTM A-351 Grade CF3M
• Hastelloy C ASTM A-494 Grade CW-6M
• And More
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Available in sizes from ½” thru 12”
Rubber Lined Bodies
3mm Minimum Lining Thickness
Cast Iron / Cast Steel / Stainless Steel body option
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Full Flat Faced Flange Lining
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Excellent for Abrasive Applications
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Broad Choice of Lining Materials as follows :
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Neoprene
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Soft Rubber ( Natural Rubber )
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Hard Rubber ( EBONITE)
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EPDM
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Hypalon
Butyl
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And More
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Glass Lined Bodies
Available in Cast Iron / Cast Steel
Excellent lining for contaminant free and
corrosion resistant applications.
100% Spark Testing before and after assembly
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assures the highest lining integrity
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Thermo Plastic Lined Valve
3mm Minimum Lining thickness
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Superior Flow Capabilities
Wide Selection of Linings
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Tefzel® (ETFE) , PVDF, FEP, PFA, HYLAR etc..
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Solid Plastic Bodies
Lightweight and Economical
Excellent Internal/External Corrosion Resistance
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Flanged, Screwed, solvent weld and thermal
weld ends available.
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Materials Include: PVC, CPVC, PVDF, PP ,
ISO PP
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TECNIK
WEIR VALVE SELECTIONS
Choice of Lining Materials :
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Neoprene…A
synthetic base elastomer with some physical
properties similar to natural rubber. Superior to natural rubber in
resistance to heat, ozone, sunlight and oil. Typical applications
include: phosphoric acids, magnesium oxide and sodium
hydroxide.
• Maximum temperature 200°F (93°C)3
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Soft Rubber…Good
resistance to most inorganic chemicals with
the exception of strong oxidizing agents. Exhibits outstanding
abrasion resistance. Typical applications include: gypsum,
flyash, titanium dioxide slurries and sewage.
• Maximum temperature 180°F (82°C)3
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Hard
Rubber…Better chemical and heat resistance than soft
rubber. Wide application in organic and inorganic acids and
chlorine gas. Typical applications include: potable water;
oxidizing agents; plating solutions; salts; sludge and ferric
chloride.
• Maximum temperature 200°F (93°C)3
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Hypalon*…Good
resistance to high concentrations of sulfuric
and nitric acids. Good heat, weather, ozone and abrasion
resistance. Other typical applications include: nickel plating
solutions and ferric chloride.
• Maximum temperature 200°F (93°C)3
Diaphragm Selection
NOTE : Diaphragms at maximum temperature cannot be used satisfactorily at
maximum pressures. Pressure/temperature charts Temp.°F2,4 Temp.°C
TECNIK
ACTUATOR SIZING PARAMETERS:
ACTUATOR SELECTION FOR 100% & 0% PRESSURE DROP (?P)
100% Pressure Drop (?P)
When the pressure is only on one
side of the diaphragm and the outlet
is open to atomospheric pressure
less force is required to close the
valve.
0% PRESSURE DROP (?P)
When the pressure is exerted on both
side of the diaphragm more force is
required to close the valve.
The following information is necessary to properly size Diaphragm Valve actuators:
1)
Line Pressure: The fluid pressure in the pipeline
against which the actuator must close the valve
and remain leak tight.
2)
Pressure Drop: Two pressure drop conditions are
recognized in industry for the purpose of valve
selection. These are specified as either 0% or
100%Ä P (delta-P).
The system condition for 0% pressure drop
applies when a valve is being closed against a
maintained pressure on the inlet and outlet of the
valve
A second condition exists when the valve is
closed before line pressure is applied to the inlet
of the valve or if the valve has pressure on the
inlet and outlet in the open position and as the
valve closes, the pressure on the outlet reduces
to no or low line pressure.
3)
Valve Diaphragm Type: The valve diaphragm
material can directly affect the required amount
of thrust needed to shut a valve. Sizing charts
are provided for both elastomer and PTFE
diaphragms at both 100% or 0%Ä P.
4)
Valve Size: Usually the same as the bore of the
pipeline, in some cases the valve size is
intentionally smaller to reduce flow through the
pipeline.
5)
On/Off or Control: The weir type valve is suitable
for on/off and limited throttling applications. If
control or throttling is required, refer to the
Dualrange information contained in this section
of the binder.
(For actuator details please refer the TECNIK actuator
literature)
TECNIK
CL
ØB
5
4
H
6
2
THK.
H1
3
ØD
1
F/F
MOUNTING DIMENSIONS
BILL OF MATERIAL
Sr.
No.
PART DESCRIPTION
MATERIAL
QTY.
VALVE
SIZE
F/F ±3
ØD
THK.
H1
20 mm
133
108
15
70
25 mm
133
108
15
70
40 mm
166
127
17
90
50 mm
196
152
20
130
65 mm
222
178
22
140
80 mm
260
191
23
180
100 mm
311
230
23
230
150 mm
412
280
25
380
1
BODY FLANGED
CS/SS+PPH/PVDF/FEP
PFA LINED LINING : 3mm THK.
1
2
BONNET
GRADED CAST IRON
1
3
NUT & BOLTS
SS-304 / STEEL PLATED
1
4
PNEUMATIC
ACTUATOR
HANDWHEEL
ARRANGEMENT
CAST IRON EPOXY PAINTED
-
CAST IRON EPOXY PAINTED
1
SS
1
5
6
INDICATOR SCALE
MOUNTING DIMENSIONS
H
CL
ØB
NOTE : ABOVE DIMENSIONS ARE AS PER
ACTUATOR MAKE & MODELS &
WILL BE PROVIDED WITH AFTER
DRAWING AS PER CUSTOMER
REQUIREMENT.